Dominic Day will return to the Premiership to join champions Saracens from Super Rugby strugglers Rebels next season.
The lock, capped three times by Wales, has agreed a two-year deal with the European champions following a spell in Australia.
Day also played for Toyota Verblitz in Japan after leaving Bath last year, but is now set for a move to Allianz Park.
Saracens director of rugby Mark McCall said: "We believe Dom will prove to be a fine addition to the group and we are delighted that he has decided to join our club.
"He is a proven Premiership player, has over 200 career appearances, and who, at the age of 31, is in his prime.
"On the field, he is precisely the kind of big, dominant lock forward we have been seeking to bolster our squad, and off the field, he is exactly the type of character who we believe will thrive in our culture."
Day said: "I'm very much looking forward to joining Saracens next season.
"They've set the standard across Europe in recent years and when you look at the playing talent already at the club, along with the coaching set up, it's a very exciting prospect to be a part of."